I had no idea there were people who weren't sensitive to poison ivy. I don't know if I've ever encountered it; I've been hiking a few times, and I've never had a reaction consistent with exposure. But maybe I'm just one of the lucky 15%.

The one out here is poison oak, but it's the same sensitivity to urushiol.

I'm another one that is probably not sensitive to it. I can't be absolutely sure, as I've never had a definite exposure, but I've been the only one of a group not to have a reaction, and SO got it very badly one time from, we assume, the dog having gotten in some. In both instances it would be extremely unlikely that I wasn't exposed at the same time.